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Feedback control of ejection state of a pneumatic valve-controlled micro-droplet generator through machine vision
Author(s): Fei Wang; Jiangeng Li; Yiwei Wang; Weijie Bao; Xiao Chen; Hui Zhang; Zhihai Wang
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Paper Abstract

Pneumatic valve-controlled micro-droplet ejection is a printing technique that has potential applications in many fields, especially in the field of bio-printing. The ejection is controlled by a solenoid valve being briefly turned on, so that high pressure gas enters the liquid reservoir, forming a gas pressure pulse, forcing the liquid out through a tiny nozzle to form a micro-droplet. For bio-printing applications, the bio-inks are typically non-standard. The difficulties are not only that the initial working parameters are difficult to set, but also the working conditions change over time in many cases. In order to maintain a stable single-drop ejection state, a machine vision based ejection monitoring was designed to obtain the number, positions and sizes of the droplets for each ejection, and a feedback control is realized by adjusting the conduction time of the solenoid valve or the gas pressure at the front end of the solenoid valve.

Paper Details

Date Published: 15 March 2019
PDF: 6 pages
Proc. SPIE 11041, Eleventh International Conference on Machine Vision (ICMV 2018), 110410L (15 March 2019); doi: 10.1117/12.2522946
Show Author Affiliations
Fei Wang, Beijing Univ. of Technology (China)
Jiangeng Li, Beijing Univ. of Technology (China)
Yiwei Wang, Beijing Univ. of Technology (China)
Weijie Bao, Beijing Univ. of Technology (China)
Xiao Chen, Beijing Univ. of Technology (China)
Hui Zhang, Beijing Univ. of Technology (China)
Zhihai Wang, Beijing Univ. of Technology (China)


Published in SPIE Proceedings Vol. 11041:
Eleventh International Conference on Machine Vision (ICMV 2018)
Antanas Verikas; Dmitry P. Nikolaev; Petia Radeva; Jianhong Zhou, Editor(s)

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